y+9(y-20)=0

Solution for y+9(y-20)=0 equation:

Simplifying
y + 9(y + -20) = 0

Reorder the terms:
y + 9(-20 + y) = 0
y + (-20 * 9 + y * 9) = 0
y + (-180 + 9y) = 0

Reorder the terms:
-180 + y + 9y = 0

Combine like terms: y + 9y = 10y
-180 + 10y = 0

Solving
-180 + 10y = 0

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '180' to each side of the equation.
-180 + 180 + 10y = 0 + 180

Combine like terms: -180 + 180 = 0
0 + 10y = 0 + 180
10y = 0 + 180

Combine like terms: 0 + 180 = 180
10y = 180

Divide each side by '10'.
y = 18

Simplifying
y = 18